feat: Add Playbook Manager, Saved Searches, and Timeline View components

- Implemented PlaybookManager for creating and managing investigation playbooks with templates.
- Added SavedSearches component for managing bookmarked queries and recurring scans.
- Introduced TimelineView for visualizing forensic event timelines with zoomable charts.
- Enhanced backend processing with auto-queued jobs for dataset uploads and improved database concurrency.
- Updated frontend components for better user experience and performance optimizations.
- Documented changes in update log for future reference.

backend/alembic/versions/c3d4e5f6a7b8_add_processing_tasks_table.py

@@ -0,0 +1,48 @@
+"""add processing_tasks table
+
+Revision ID: c3d4e5f6a7b8
+Revises: b2c3d4e5f6a7
+Create Date: 2026-02-22 00:00:00.000000
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+revision: str = "c3d4e5f6a7b8"
+down_revision: Union[str, Sequence[str], None] = "b2c3d4e5f6a7"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.create_table(
+        "processing_tasks",
+        sa.Column("id", sa.String(32), primary_key=True),
+        sa.Column("hunt_id", sa.String(32), sa.ForeignKey("hunts.id", ondelete="CASCADE"), nullable=True),
+        sa.Column("dataset_id", sa.String(32), sa.ForeignKey("datasets.id", ondelete="CASCADE"), nullable=True),
+        sa.Column("job_id", sa.String(64), nullable=True),
+        sa.Column("stage", sa.String(64), nullable=False),
+        sa.Column("status", sa.String(20), nullable=False, server_default="queued"),
+        sa.Column("progress", sa.Float(), nullable=False, server_default="0.0"),
+        sa.Column("message", sa.Text(), nullable=True),
+        sa.Column("error", sa.Text(), nullable=True),
+        sa.Column("created_at", sa.DateTime(timezone=True), server_default=sa.func.now()),
+        sa.Column("started_at", sa.DateTime(timezone=True), nullable=True),
+        sa.Column("completed_at", sa.DateTime(timezone=True), nullable=True),
+        sa.Column("updated_at", sa.DateTime(timezone=True), server_default=sa.func.now()),
+    )
+    op.create_index("ix_processing_tasks_hunt_stage", "processing_tasks", ["hunt_id", "stage"])
+    op.create_index("ix_processing_tasks_dataset_stage", "processing_tasks", ["dataset_id", "stage"])
+    op.create_index("ix_processing_tasks_job_id", "processing_tasks", ["job_id"])
+    op.create_index("ix_processing_tasks_status", "processing_tasks", ["status"])
+
+
+def downgrade() -> None:
+    op.drop_index("ix_processing_tasks_status", table_name="processing_tasks")
+    op.drop_index("ix_processing_tasks_job_id", table_name="processing_tasks")
+    op.drop_index("ix_processing_tasks_dataset_stage", table_name="processing_tasks")
+    op.drop_index("ix_processing_tasks_hunt_stage", table_name="processing_tasks")
+    op.drop_table("processing_tasks")